Mascarpone Mushroom Marsala with Noodles

Name: Mascarpone Mushroom Marsala with Noodles
Ingredients: 1 tablespoon butter; 1 tablespoon olive oil; 1 small onion, sliced thinly (or 1/2 of a large onion); 2 cloves garlic, minced; 1 pound mushrooms, sliced (I used crimini, but any type will work!); 3/4 cup dry Marsala wine; 1/2 8-ounce container of mascarpone; 8 ounces frozen peas, about 1/2 of a bag, thawed; 1/2 pound short pasta, like egg noodles or rigatoni; 2 tablespoons flat-leaf parsley, chopped; Salt and pepper; Parmesan, for serving